<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue-2.6.12开发.js"></script>
</head>

<body>
    <div id="root">
        姓: <input type="text" v-model="firstName"><br><br>
        名: <input type="text" v-model="lastName"><br><br>
        全名:<sapn>{{fullName()}}</sapn>
    </div>
    <script>
        
        const vm = new Vue({
            el: '#root',
            data: {
                firstName: '颖',
                lastName: '儿',
            },
            methods: {
                fullName() {
                    return this.firstName + '-' + this.lastName
                }
            }
        })
    </script>
</body>

</html>